Evaluation of uncertainty in capturing the spatial variability and magnitudes of extreme hydrological events for the uMngeni catchment, South Africa

Kusangaya, Samuel; Toucher, Michele; Garderen, Emma Archer van

doi:10.1016/j.jhydrol.2018.01.017

Cited by 17 publications

(9 citation statements)

References 62 publications

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“…Sudden disruptive changes in flow result in high turbidity and turbulent waters; however, sustained high flows make more habitat available in newly flooded areas adjacent to the river's main stem (Junk and Wantzen 2006). This is concerning as climatic factors altered through global climate change cause erratic changes in the flow, such as flash floods (Kusangaya et al 2018). Furthermore, managed flows released suddenly, periodically, and conservatively (Riddell et al 2019) may negatively affect the responses of both L. marequensis and H. vittatus, as already shown for H. vittatus (Sonamzi et al 2020) and seen in the present study.…”

Section: Hydrocynus Vittatussupporting

confidence: 69%

Temporal movement of free-swimming fishes and their response to environmental variables in some of the rivers of Kruger National Park, South Africa

et al. 2021

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respectively. Remote telemetry techniques were used to collect data from activity sensors attached to fish. Activity (movement count per hour) from both species showed diurnal behaviour. The data analyses using generalised mixed models with random effects showed that both species responded similarly to environmental factors, with differing significance in this response. Flow was negatively correlated, and water temperature positively correlated to activity. Both variables consistently showed higher significant responses than the other environmental variables assessed. Both fish species' relationship to changes in flow and temperature can contribute to managing anthropogenic stressors and regulating flows in rivers. Further studies of this would significantly contribute to conserving these and other fish species in Kruger National Park.

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Section: Hydrocynus Vittatussupporting

confidence: 69%

Temporal movement of free-swimming fishes and their response to environmental variables in some of the rivers of Kruger National Park, South Africa

et al. 2021

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“…Developed by the US Nature Conservancy (TNC), the indicators of hydrologic alteration (IHA) approach [65][66][67] is a practical tool for calculating the characteristics of natural and altered hydrological regimes [68]. It compares hydrological data sets by calculating multi-variate statistics to assess the degree of hydrological alteration [69]. A total of 67 statistical parameters closely related to river ecosystems are calculated in the IHA approach, which are divided into two groups: 33 IHA parameters and 34 environmental flow component (EFC) parameters.…”

Section: Indicators Of Hydrologic Alterationmentioning

confidence: 99%

Impacts of Climate Change and Land-Use Change on Hydrological Extremes in the Jinsha River Basin

Chen

Wang

et al. 2019

Water

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Hydrological extremes are closely related to extreme hydrological events, which have been and continue to be one of the most important natural hazards causing great damage to lives and properties. As two of the main factors affecting the hydrological cycle, land-use change and climate change have attracted the attention of many researchers in recent years. However, there are few studies that comprehensively consider the impacts of land-use change and climate change on hydrological extremes, and few researchers have made a quantitative distinction between them. Regarding this problem, this study aims to quantitatively distinguish the effects of land-use change and climate change on hydrological extremes during the past half century using the method of scenarios simulation with the soil and water assessment tool (SWAT). Furthermore, the variations of hydrological extremes are forecast under future scenarios by incorporating the downscaled climate simulations from several representative general circulation models (GCMs). Results show that: (1) respectively rising and declining risks of floods and droughts are detected during 1960–2017. The land use changed little during 1980–2015, except for the water body and building land. (2) The SWAT model possesses better simulation effects on high flows compared with low flows. Besides, the downscaled GCM data can simulate the mean values of runoff well, and acceptable simulation effects are achieved for the extreme runoff indicators, with the exception of frequency and durations of floods and extreme low flows. (3) During the period 1970–2017, the land-use change exerts little impact on runoff extremes, while climate change is one of the main factors leading to changes in extreme hydrological situation. (4) In the context of global climate change, the indicators of 3-day max and 3-day min runoff will probably increase in the near future (2021–2050) compared with the historical period (1970–2005). This research helps us to better meet the challenge of probably increased flood risks by providing references to the decision making of prevention and mitigation measures, and thus possesses significant social and economic value.

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“…The field application of the telemeter tags on terrapins in this study was important in understanding the effects of drought and subsequent flooding at Ndumo and the availability of suitable habitat in Tala's impoundments. With increased erratic rainfall predicted for the region because of climate change (IPCC, 2021;Kusangaya et al, 2018), the flood events as documented in the present study could become more frequent and coupled by drier periods between rainfall events can further affect the persistence of terrapins in the region. Our results demonstrated the significant effect temperature and rainfall have on both species temporal activity and presence within an area.…”

Section: Discussionmentioning

confidence: 66%

Presence And Temporal Activities Of Serrated Hinged Terrapin (Pelusios sinuatus) And Marsh Terrapin (Pelomedusa galeata) In KwaZulu-Natal, South Africa, Assessed Using Telemetry

Price

Burnett

O’Brien

et al. 2022

Tropical Conservation Science

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Background and Aims For the first time in Africa, two freshwater turtle species (hereafter terrapin) presence and temporal activity in their habitats were investigated using radio telemetry. Methods Telemeter tags were attached to Pelusios sinuatus ( n = 10) at Ndumo Reserve and Pelomedusa galeata ( n = 10) at Tala Reserve. Pelusios sinuatus tagged individuals were monitored between August–December 2016 at Ndumo, while P. galeata individuals were monitored between November 2017–July 2018 at Tala. Sensors on the tag determined the tag temperature and temporal activity. We examined both species' frequency distributions of inactivity to time of day. Activity trends for both species in comparison with ambient temperature and tag temperature were analyzed. Results Tags showed individuals presence or absence as detected by fixed remote networks at the study sites. Tagged P. sinuatus in Ndumo disappeared after a flood without returning after the flood receded. Both species were diurnal, with P. galeata showing a greater ability to maintain tag temperature above ambient temperature in the first 10 h of a day than P. sinuatus. Climatic data, including ambient temperature, rainfall, and wind, were retrieved from weather stations. The most significant climatic variable that affected activity was ambient temperature. Rainfall also showed a significant effect, but wind showed no significant effect. Implications for Conservation This method can become a valuable tool for long-term remote monitoring of other semi-aquatic reptiles in wetlands that are increasingly under anthropogenic and climatic pressure. Thus, its implications for conservation are significant.

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Evaluation of uncertainty in capturing the spatial variability and magnitudes of extreme hydrological events for the uMngeni catchment, South Africa

Cited by 17 publications

References 62 publications

Temporal movement of free-swimming fishes and their response to environmental variables in some of the rivers of Kruger National Park, South Africa

Temporal movement of free-swimming fishes and their response to environmental variables in some of the rivers of Kruger National Park, South Africa

Impacts of Climate Change and Land-Use Change on Hydrological Extremes in the Jinsha River Basin

Presence And Temporal Activities Of Serrated Hinged Terrapin (Pelusios sinuatus) And Marsh Terrapin (Pelomedusa galeata) In KwaZulu-Natal, South Africa, Assessed Using Telemetry

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